Forcing Outlook 2003 to 'refresh'

Hello, a recent domain migration forced me to create new mail profiles. These new profiles are hooked up with with the zimbra outlook connector. Of the 20 machines I did yesterday, they were all fine except for a couple. On 3 machines, Outlook is not pulling in messages/calendar/etc. I know that it made a successful connection, because the folder listing in Outlook updated, and pulled some custom folders. For example, a user has a folder in Zimbra called 'payroll'. This folder displays in outlook, so I know that it made a successful connection to the server.

However, the inbox is empty. Calendar is empty. Hitting send/receive lists the progress as 'processing'. Any suggestion on how to force things to refresh and start pulling data?